One type of connective tissue defect in humans is caused by a very rare autosomal dominant...
One type of connective tissue defect in humans is caused by a very rare autosomal dominant allele. Connective tissues in all body cells are affected, but individuals usually die from a ruptured aorta as a result of the defective connective tissue in the aortic wall. What is the most likely probability that an offspring of a man who had this condition and died of a ruptured aorta at age 24 will have this condition?
Homework Answers
Because the condition is rare, let us assume that the individual is heterozygous. Because for a person to be homozygous, both parents have to be either sufferers or carriers. Because the gene is dominant, even in heterozygous condition also it expresses.
When the person is heterozygous (carrier), the chances of his offspring being a sufferer is 50%. This is when mother is not suffering the disease. Because the disease is very rare, we presume that the mother is normal.
Father heterozygous (Aa) carrier and mother normal (aa). In such a scenario, the offspring will have 1/2 probability of being a sufferer. If father is homozygous dominant, offspring can be 100% sufferer.
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